Swapping Black Keys

This ‘jazzy’ piece I composed (only) for black keys. You may print and use it. It is meant for everyone after a few years of piano lessons.
I hope it is not hard to play, although the rhythm can be challenging in the beginning (and of course the reading of the flats might be an obstacle). In fact I would like to hear your feedback on how hard it is to handle!
I think it is easier if you use the mp3 audio to understand the rhythm. If you feel the quavers, bar 1-4 is 1-2-3 /1-2-3 / 1-2-3 / 1-2-3 / 1-2 / 1-2 or ‘pineapple /pineapple /pineapple /pineapple /kiwi /kiwi’ (if you don’t like kiwis you can use ‘mango/mango’ )
Bar 5-8 is ‘pineapple/pineapple/kiwi/pineapple/pineapple/kiwi’ etc.